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14
DHCP mode or the IP address can be set and read the VTR1 Configuration Program available for
download at www.gardasoft.com.
8.2.2
Automatic Sensing
All the features below are implemented in a Configuration Program with C++ source code
available from www.gardasoft.com.
The VTR1 will send out a message on three events:
On power up
•
When an IP address is received or renewed by DHCP
•
When an enquiry message is received
•
On the first two events, the message is broadcast. On the third it is a reply to a single IP address.
An enquiry message is a UDP packet from source port 30310, destination port 30311 with the
message body "Gardasoft Search" (8-bit ASCII, 13 characters).
The message output by the VTR1 is a UDP packet from source port 30311, destination port
30310. It is formatted as:
Gardasoft,VTR1,000000,111111111111,22222222
(8-bit ASCII, 44 characters), where
000000
111111111111
22222222
For example for VTR1 serial number 12345, IP address 192.168.1.103, MAC address
00.0B.75.01.80.99 the packet contains:
Gardasoft,VTR1,012345,000B75018099,C0A80167
the serial number of the unit
the MAC address in 6 HEX bytes
the IP address in 4 HEX bytes
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